Copper Test Strips for Pool Water: 25 Counts Pool Copper Test Kit for Testing Range 0-2 ppm Copper in Swimming Pool Hot-Tub Spa - Pool Metal Test Kit for Above-Ground and Inground Pool Testing Copper auspowers_batchthree the blue light will light

the blue light will light up and flash

5-Inch-by-

Price For: Each Item: Push Nut Material: Spring Steel Thickness Tolerance: +/-0

9" size fits safely in your back pocket

and its retro design fits perfectly with your Apple Watch display

Copper Test Strips for Pool Water: 25 Counts Pool Copper Test Kit for Testing Range 0-2 ppm Copper in Swimming Pool Hot-Tub Spa - Pool Metal Test Kit for Above-Ground and Inground Pool Testing Copper auspowers_batchthree the blue light will lightCopper Test Strips for Pool Water: 25 Counts Pool Copper Test Kit for Testing Range 0 2 ppm Copper in Swimming Pool Hot Tub Spa Pool Metal Test Kit for Above Ground and Inground Pool Testing Copper Product Features Why You Should Test for Copper in Your Pool: Copper can sneak into your pool through source water, copper based treatments, and corrosion. High copper levels can disrupt your pool's chemical balance, damage equipment, and cause skin and eye